Research purpose: In order to realize the high velocity, high comfort, high security, the high-speed railway (contains speed 200 km passenger dedicated railway line) makes high standard request for the track geometry size and the pointing accuracy that affects the railroad smoothness. As the survey localization datum system of the railway line survey, design, construction, operation and maintenance，the design plan of construction coordinate system of Passenger Dedicated Railway Line is whether reasonable, projection scale error whether can be under the active control, will have the direct influence to the railway engineering construction quality. Traditional level of railways uses the national unification 3 °zone Gauss projection Plane rectangular coordinate system directly, but it is already unsuitable to Passenger Dedicated Railway Line construction standard request as the railway line construction coordinate system the plan. Therefore, in the Passenger Dedicated Railway Line feasibility study stage, connecting with project characteristics, the reasonable design and choice to the construction coordinate system of Passenger Dedicated Railway Line and effective control of the projection scale error, is important premise to guarantee the engineering construction smooth implementation and the project quality.
Research method: Through the basic principle and the main characteristic of the projection scale error as well as satisfies Passenger Dedicated Railway Line 2.5cm/km projection scale error request region change trend analysis. this text deliberated the method about taking the railway line each main slope change country unification 3° zone coordinate and the road should design elevation as the basic parameter to designs the construction coordinate system of Passenger Dedicated Railway Line.
Research result: The research obtains four kind of plan, under the railway line ym-Hm, section change tendency different condition, the construction coordinate system of Passenger Dedicated Railway Line uses the national unification 3° zone Gauss conformal projection plane rectangular coordinate system directly, or the design uses projection datum plane with compensation effect 3°the zone Gauss conformal projection plane rectangular coordinate system, the arbitrary zone Gauss conformal projection plane rectangular coordinate system. the arbitrary zone Gauss conformal projection plane rectangular coordinate system with projection datum plane with compensation effect.
Research conclusion: It achieves effectively to control projection scale error to the Passenger Dedicated Railway Line influence goal.
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